Diabetes Diabetes Solutions

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  • Blood Sugar Monitoring

    The American Diabetes Association published revised Standards of Care for diabetes, emphasizing that high-quality diabetes care must be individualized to reflect the needs, interests, and abilities of each person. The primary goal of care is to reduce blood glucose levels to as close to normal as is reasonable. To monitor success toward that goal, the diabetic should self-manage in a responsible manner using diet revision and exercise as the primary strategy and should self-monitor blood glucose levels at home.

    The secondary goal is to monitor for and, if detected, treat developing complications. This requires annual eye exams to detect retinopathy, annual urinalysis to search for early signs of nephropathy, periodic foot examinations, regular blood pressure and cholesterol and triglyceride testing to warn of impending heart disease. The official view is that patient education and motivation must be a central component of quality diabetes care because each person must provide daily self-care:

    1. managing food selection, meal planning
    2. staying in control of the diet
    3. getting daily exercise
    4. self-monitoring blood glucose
    5. taking medication, if required
    6. quitting smoking

    Blood Sugar Monitoring

    Home testing of blood glucose levels is useful for the self-managing diabetic. You have to remember that the reason for doing a test is to provide you with information that influences the decisions you make. An insulin dependent diabetic will make decisions about the dose and timing of insulin injections based on blood glucose levels. Blood glucose measurements are required to make good decisions about adjusting the insulin dose. A person with early type 2 diabetes will need less frequent blood glucose measurements to guide food choices and adjust activity levels.

    Several testing units are available and all are relatively easy to use. There are two blood sugar scales in use - the metric system mmol/l and the older mg/dl scale. The most important number is 7 mmol/l = 120 mg/dl - the upper limits of normal range for fasting blood sugar and 2 hours after-eating blood sugar.

    Margin of Error and Different Blood Glucose Scales

    Blood glucose values in medical publications are measured from venous blood drawn from your arm. Test results vary depending on the age of the blood sample and the calibration of lab instruments. There are no measurements without error. A properly calibrated machine will have a known error range. Glucometers are reasonable devices for home monitoring that will track changes in blood glucose although up to 10% error can be assumed so that decisions based on small decimal point differences are not appropriate.

    At home, you prick your skin and test blood from capillaries under the skin where glucose content tends to be higher than venous blood. Capillary glucose values may be 0.5 to 3 mmol/L higher than venous blood values. Also, capillary values vary with the skin puncture location. Finger tips are often used, but have more nerve ends and a smaller surface area. Samples taken from the palms of the hands are also reliable. Finger tip and palm blood samples respond quickly to changes in blood glucose. Forearm samples are slower to change. When blood glucose is rising quickly after a meal, finger tip readings can be up to 3 mmol higher than venous blood samples. All tests results are approximations that include some variation. In other words, a capillary reading of 7.4 in the morning may be considered "normal" in terms of a venous blood standard of normal (less than 7.)

    Ames stated in its glucometer instructions that venous blood levels are 7% lower than capillary readings. One touch meters are calibrated so that finger sample tests better correspond with readings from venous blood done in a lab. Usually, meter calibration information is in the fine print of the product description that comes with the device.

    Some test strips are small and anyone with hand or visual difficulties will have difficulty placing the strip into the measuring device and touching the strip in the right place to a small drop of blood. Some meters can download data and have associated software that tracks blood glucose values over time. The OneTouch Ultrasmart device retains data, permits the entry of additional data such as exercise, insulin and medication and presents a variety of useful reports. Some training is required to make good use of this device.

    Three glucose measurements are useful for different reasons

    Fasting blood glucose levels, taken in the morning before eating, should fall in a normal range. The goal is to keep this value under 7 mmol/L or 120 mg/dl. (glucometer test values up to 8.0mmol)

    Two hours after eating: blood sugar rises and then falls to a baseline level. By sampling blood sugar levels two hours after eating, you find out if glucose is being removed from your blood in a reasonable time. The sugar level peaks in 30-60 minutes and the falls back to a baseline level. The timing and height of the peak level will vary with the composition of the meal and activity levels. The glycemic index has been developed to show the peak sugar response after eating individual foods.

    The goal is to show values less than 7 mmol or 120 mg at two hours. Higher values tell you that you must do two things- change the food or meal that caused high sugar level and exercise after the meal to increase glucose utilization.

    Checking symptomatic episodes: you measure blood sugar when you are not feeling well to find out how your symptoms correlate with the blood sugar level. High levels are associated with an intoxicated feeling - drowsy, hard to concentrate, judgment impaired. Levels above 17 mmol or 300 mg are dangerously high - you are likely to want to sleep at this level but the most effective way to reduce the sugar levels is to exercise as vigorously as you can.

    Levels below 4.5 capillary may be associated with hypoglycemic symptoms - you feel strange, anxious, irritable; a tremor develops if the blood sugar value falls lower and you become desperate to eat something. If you can take a quick sugar hit - a glass of orange juice will do and measure your sugar immediately you can determine how low the value dropped; as you feel better do another blood sugar check to find the value that feels normal.

    Hemoglobin A1C (HbA1c)

    High levels of blood glucose lead to glycosylation reactions with a variety of proteins. Glycated protein macromolecules become malformed, cross-linked polymers and are believed to play a significant role in the development of the complications of diabetes. Therapy is aimed at minimizing the formation of these cross-linked proteins by lowering the average blood glucose concentrations.

    Diabetic patients are encouraged to undergo routine monitoring of the levels of the cross-linked molecule, hemoglobin A1C (HbA1c), as a marker of long-term glycemic control. Glycated hemoglobin is assayed in a sample of blood. Red blood cells have a life span of 90 to 120 days, HbA1c readings provide a good indication of the average glucose control over the past 90 days but will not show a recent change. The goal is to keep HBA1c at less than 7 percent (of the total hemoglobin).

    While self monitoring works best if good records are kept and reviewed regularly, I discovered that only a small number of technical enthusiasts with DB2 will use all the features of glucose monitoring devices and keep adequate records long term. I also discovered that very few people will use nutrient analysis and meal planning software, even when good programs are available online at low cost. Professionals monitoring patients also will seldom use daily monitoring and meal planning software because it is too time consuming.

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